Taper gauge



W. A. ALLEN TAPER GAUGE 1 Dec. 4, 1923.

Filed Dec. 12; 1921 4. r M i E f.

Parental Dec."4, 192:).

UNITED STATES.

WILLIAM A. ALLEN, OF INDIANAPQLIS, INDIANA, ASSIGNOR T0 WILLIAM A. ALLELIv AND C. STADTLANDEE, BOTH OF INDIANAPOLIS, INDIANA, A COCPARTNER- mar na canon.

To all whom it may conccm:

Be it known that I, WILLIAM A. ALLEN,

a citizen of the United States, residing at The object ofmy invention is tmproduce. an efiici'ent instrument by means of which the included angle of an existing or desired taper may be determined and by means of which. a cutting tool of ,a lathe or other similar machine may be rately set, in order that a be produced.

The accompanying drawings illustrate my invention: Fig. 1 is a plan of my improved instrument, the head stock, ;-tail stock, and

tool rest of a lathe being shown in dotted lines; Fig. 2 a' fragmentary section, on an enlarged scale, of the adjusting nut and adjacent parts, and Fig. 3 an end elevation as seen from the-right of Fig. 1, the indicator or gauge'bar being closed.

In the drawings 10 indicates the main body of the instrument provided atits oppo site endswith alined centers- 11. Pivoted i at 12 upon the main body is an indicator or gauge bar 13 having parallel faces 14: and 15, t e face 14 being preferably radial to the axis 12. A light spring 16 serves to urge bar 13 to a zero position against ,a? stop 17.

at which time the surface 14 will be parallel with the-axis 18 of the main body 10.

Splined in body 10, at. right angles to axis is a threaded spacer 19, the end 19' of which is accurately squared and preferably.

hardened. Secure to body-10 is a block 20 provided with a finger 21 lying parallel with the body 10 provided with a perforation .22 in which is journaled a sleeve 23 having an annular flange 24 which bears a setting mark 25. Sleeve 23 maybe held in any desired position of angular adjustment in perforation 22by a clamping screw 26. j-

Lying between body 10 and flan e 24 is an adjusting nut 27 Y which is provi ed with a circumferential decimal series of indithreadedupon screw 19, if desired, butt in order that wear may be readily takeILup I provide the nut with a conical seat 30 in "whicliis mounted a nut '31 having a conical exterior and having its body longitudinally (giilickly and accuesired taper may slotted at Various points as indicated at 32 so that the internal diameter of the nut may be slightly varied.

In order to accomplish the adjustment of is threaded externally into the threads 36 in member 27",- the threads 34 and '36 being of I difi'erent pitch.

The number of threads per inch on screw 19,-the number of graduations in scale 28, and the distance between axis 12 and the line of'the point of contact of the end of the screw 19 with surface 14,- measured as the shortest distance between axis 12 and a line parallel with the axis of the screw 19,

should preferably be so proportioned that movement of the adjusting nut through one division of scale 28 will shift screw 19 through'a unit distance expressed in decimals.

The face 15 of indicator or gauge bar i is provided with a well defined indicator line 55 which is so placed as to be at all definite included-angle; He will turn to a table oftangents; find the value of the tangent of half-the included angle; and then shift the nut 27- through an angular distance which,'by a reading of the scale 28 corresponding to the value of the tangent,

will project said screw from the zero position to the desired extent. 'This will place "the surf'ace 15 parallel with line 50 which will at that time lie at an angle toaxis 18 equal to half the desired included angle,

The operator will then,'by means of a. surface gauge, bring line '55 up into thehorizontal plane of the axis 18 and hold the same in that position while shifting the tool post 51 so' as to slide a gauge '52 along the surface .15 to determine whether ornot the tool rest has beenset at a proper angle, corresponding with the. setting-of the surface 15. If a workman has been called-upon to produce a taper adding a given taper per inch it is. evident that one half of this amount will correspond to the tangent'of half the included angle and he will obtain a proper setting of indicator or gauge bar 13 by direct reading of scale 28.

If the work required is defined as a conical frustum of given end diameters and lengths it is apparent that the difference between the. half diameter of the larger/end and the half diameter of the smaller end, divided by the length, will be the direct reading on the scale 28, or taper per inch.

If taper per foot is given or taper per inch, the desired reading of the instrument will be defined by the simple operation of division. All of the above is based upon the assumption that the parts are so proportioned that the reading of scale 28 corresponds to taper per inch.

Of course, while that is probably the most convenient proportionate parts, a departure .from this proportioning, in order that the scale. 28 may give the reading in different terms, will not depart from the spirit of my invention. v

Many other illustrations of the manner of use of the instrument might be given but they will be readily apparent to workmen who are reasonably skilled.

By supporting the instrument on surface 41 of foot existing tapers may be gauged without utilizing the centers 11-11. I

I claim. as my 1nvention:

1. An angle gauge comprising a main body having alined centers in its opposite ends, a gauge bar pivoted upon the main body, a spacer member carried by the main body at right angles to the zero position of the gauge bar, and means by which said spacer member may be accurately positioned at difi'erent amounts of projection from the zero'posltion.

2. An angle gauge comprising amain body having means for properly positioning the same for. gaging purposes, a gauge bar pivoted upon the main body and having one 'ace thereof forming a gauging surface, a spacer member carried by the main body at right angles to the zero position of the gauge bar, and means by which said spacer member may be accurately positioned at different amounts of projection from the zero position.

3. An angle gauge comprising a maini body having alined centers in its opposite ends, a gauge bar pivoted upon the main body, a threaded spacer member in said gauge bar and in the plane of movement of the gauge bar and at right angles to the zero position of said gauge bar, a nut having a threaded engagement with said spacer and journaled on the main body, and an indicator scale carried by said nut to indicate its angular position and thereby indicate the amount of projection of the spacer member from zero position.

4. An angle gauge comprising a main body having alined centers in its opposite ends, a gauge bar pivoted upon the main body, a threaded spacer member in said 'gau e bar and in the plane of movement of t e gauge bar and at right angles to the zero position of said gauge bar, a nut having a threaded engagement with said spacer and journaled on the main body, and an indicator scale carried by said nut to indicate its angular position and thereby indicate 7 the amount of projection of the spacer memher from zero'position, said nut comprising an axially adjustable'threaded element and 'a body in which said element is mounted.

In witness whereof, I have hereunto set my hand at Indianapolis, Indiana, this 8th day of December, A. D. one thousand nine hundred and twenty-one.

WILLIAM A. ALLEN. 

